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   &#160;<span id="projectnumber">Version 2.1.3</span>
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   <div id="projectbrief">Real-Time Operating System: API and RTX Reference Implementation</div>
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<div class="title">Create an RTX5 Project </div>  </div>
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<div class="textblock"><p>The steps to create a microcontroller application using RTX5 are:</p>
<ul>
<li>Create a new project and select a microcontroller device.</li>
<li><p class="startli">In the Manage Run-Time Environment window, select <b>CMSIS::CORE</b> and <b>CMSIS::RTOS2 (API)::Keil RTX5</b>. You can choose to either add RTX as a library (Variant: <b>Library</b>) or to add the full source code (Variant: <b>Source</b> - required if using the <a href="https://www.keil.com/pack/doc/compiler/EventRecorder/html/index.html" target="_blank"><b>Event Recorder</b></a>):</p>
<div class="image">
<img src="manage_rte_output.png" alt="manage_rte_output.png"/>
</div>
</li>
<li>If the <b>Validation Output</b> requires other components to be present, try to use the <b>Resolve</b> button.</li>
<li><p class="startli">Click <b>OK</b>. In the <b>Project</b> window, you will see the files that have been automatically added to you project, such as <b>RTX_Config.h</b>, <b>RTX_Config.c</b>, the library or the source code files, as well as the system and startup files:</p>
<div class="image">
<img src="project_window.png" alt="project_window.png"/>
</div>
</li>
<li>If using the Variant: <b>Source</b> as stated above, you have to assure to use at least C99 compiler mode (Project Options -&gt; C/C++ -&gt; C99 Mode).</li>
<li><p class="startli">You can add template files to the project by right-clicking on <b>Source Group 1</b> and selecting <b>Add New Item to 'Source Group 1'</b>. In the new window, click on <b>User Code Template</b>. On the right-hand side you will see all available template files for CMSIS-RTOS RTX:</p>
<div class="image">
<img src="add_item.png" alt="add_item.png"/>
</div>
</li>
<li><a class="el" href="config_rtx5.html">Configure</a> RTX5 to the application's needs using the <b>RTX_Config.h</b> file.</li>
</ul>
<h1><a class="anchor" id="cre_rtx_cortexa"></a>
Additional requirements for RTX on Cortex-A</h1>
<p>Cortex-A based microcontrollers are less unified with respect to the interrupt and timer implementations used compared to M-class devices. Thus RTX requires additional components when an A-class device is used, namely <a href="../../Core_A/html/group__irq__ctrl__gr.html"><b>IRQ Controller (API)</b></a> and <a class="el" href="group__CMSIS__RTOS__TickAPI.html">OS Tick (API)</a> implementations.</p>
<div class="image">
<img src="manage_rte_cortex-a.png" alt="manage_rte_cortex-a.png"/>
</div>
<p>The default implementations provided along with CMSIS are</p>
<ul>
<li>Arm <a href="../../Core_A/html/group__GIC__functions.html">Generic Interrupt Controller (GIC)</a></li>
<li>Arm Cortex-A5, Cortex-A9 <a href="../../Core_A/html/group__PTM__timer__functions.html">Private Timer (PTIM)</a></li>
<li>Arm Cortex-A7 <a href="../../Core_A/html/group__PL1__timer__functions.html">Generic Physical Timer (GTIM)</a></li>
</ul>
<p>For devices not implementing GIC, PTIM nor GTIM please refer to the according device family pack and select the proper implementations.</p>
<h1><a class="anchor" id="cre_UsingIRQs"></a>
Using Interrupts on Cortex-M</h1>
<p>On Cortex-M processors, the RTX5 kernel uses the following interrupt exceptions. The table below also lists the priorities that must be assigned to these interrupts.</p>
<table class="doxtable">
<tr>
<th align="left">Handler </th><th align="left">Priority </th><th align="left">Interrupt/Exception  </th></tr>
<tr>
<td align="left">SysTick </td><td align="left">lowest </td><td align="left">Kernel system timer interrupt to generate periodic timer ticks </td></tr>
<tr>
<td align="left">PendSV </td><td align="left">lowest </td><td align="left">PendSV (request for system-level service) when calling certain RTX functions from <b>Handler</b> mode </td></tr>
<tr>
<td align="left">SVC </td><td align="left">lowest+1 </td><td align="left">Supervisor Call used to enter the RTOS kernel from <b>Thread</b> mode </td></tr>
</table>
<p>Other device interrupts can be used without limitation. For Arm Cortex-M3/M4/M7 /M23/M33/M35P processors, interrupts are never disabled by RTX Kernel.</p>
<p><b>Usage of interrupt priority grouping</b></p>
<ul>
<li>The interrupt priority grouping should be configured using the CMSIS-Core function NVIC_SetPriorityGrouping before calling the function <a class="el" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221">osKernelStart()</a>. The RTX kernel uses the priority group value to setup the priority for SysTick and PendSV interrupts.</li>
<li>The RTX kernel sets the priority for the interrupts/exceptions listed in above table and uses the lowest two priority levels.</li>
<li>Do not change the priority used by the RTX kernel. If this cannot be avoided, ensure that the preempt priority of SysTick/PendSV is lower than SVC.</li>
<li>Permitted priority group values are 0 to 6. The priority group value 7 will cause RTX to fail as there is only one priority level available.</li>
<li>The <b>main stack</b> is used to run the RTX functionality. It is therefore required to configure sufficient stack for the RTX kernel execution.</li>
</ul>
<p><b>Code Example</b> </p>
<div class="fragment"><div class="line"><a class="code" href="group__CMSIS__RTOS__KernelCtrl.html#gae818f6611d25ba3140bede410a52d659">osKernelInitialize</a>();                            <span class="comment">// initialize RTX</span></div>
<div class="line">NVIC_SetPriorityGrouping (3);                    <span class="comment">// setup priority grouping</span></div>
<div class="line">tread_id = <a class="code" href="group__CMSIS__RTOS__ThreadMgmt.html#ga48d68b8666d99d28fa646ee1d2182b8f">osThreadNew</a>(tread_func, NULL, NULL);  <span class="comment">// create some threads</span></div>
<div class="line"><a class="code" href="group__CMSIS__RTOS__KernelCtrl.html#ga9ae2cc00f0d89d7b6a307bba942b5221">osKernelStart</a> ();                                <span class="comment">// start RTX kernel</span></div>
</div><!-- fragment --><h1><a class="anchor" id="cre_rtx_proj_specifics"></a>
Add support for RTX specific functions</h1>
<p>If you require some of the <a class="el" href="group__rtx5__specific.html">RTX specific functions</a> in your application code, #include the <a class="el" href="theory_of_operation.html#rtx_os_h">header file rtx_os.h</a>. This enables <a class="el" href="theory_of_operation.html#lowPower">low-power</a> and <a class="el" href="theory_of_operation.html#TickLess">tick-less</a> operation modes.</p>
<h1><a class="anchor" id="cre_rtx_proj_er"></a>
Add Event Recorder Visibility</h1>
<p>RTX5 interfaces to the <a href="https://www.keil.com/pack/doc/compiler/EventRecorder/html/index.html" target="_blank"><b>Event Recorder</b></a> to provide event information which helps you to understand and analyze the operation.</p>
<ul>
<li>To use the Event Recorder together with RTX5, select the software component <b>Compiler:Event Recorder</b>.</li>
<li><p class="startli">Select the <b>Source</b> variant of the software component <b>CMSIS:RTOS2 (API):Keil RTX5</b>.</p>
<div class="image">
<img src="event_recorder_rte.png" alt="event_recorder_rte.png"/>
<div class="caption">
Component selection for Event Recorder</div></div>
</li>
<li>Enable the related settings under <a class="el" href="config_rtx5.html#evtrecConfig">Event Recorder Configuration</a>.</li>
<li>Build the application code and download it to the debug hardware. Once the target application generates event information, it can be viewed in the µVision debugger using the <b>Event</b> <b>Recorder</b>. </li>
</ul>
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